AB309A HP 8 GB High-Density SyncDRAM Memory Quad

AB309A is an 8 GB high-density SyncDRAM memory module set: an upgrade kit of four 2 GB high-density SDRAM DIMMs. The single-DIMM spare is AB309-69001, a 2 GB high-density SDRAM DIMM. Its earlier-generation number is A6100A.

The HP 9000 rp8420 and the rp7420 use the same 8 GB quad, as do the rx7620 and rx8620. With the 2048 MB DIMM as the only size, the maximum capacity is 64 GB on the rp7420 and rx7620 and 128 GB on the rp8420 and rx8620.

The loading rules for the quad: four DIMMs of equal size per quad, 2 GB as the smallest amount per cell, and the four densities of 2 GB (4x512 MB), 4 GB (4x1024 MB), 8 GB (4x2048 MB) and 16 GB (4x4096 MB). The system maximum is 128 GB on the rp7420 and rx7620, using eight 16 GB quads, and 256 GB on the rp8420 and rx8620, using sixteen 16 GB quads.

Place quads in the order 1st (0A, 0B, 1A, 1B), 2nd (2A, 2B, 3A, 3B), 3rd (4A, 4B, 5A, 5B) and 4th (6A, 6B, 7A, 7B) on each cell board. A cell holding a multiple of 8 DIMMs fills both memory buses; one bus alone yields half the peak bandwidth. Because a partition cannot combine 4 GB DIMMs with the non-stacked 512 MB, 1 GB and 2 GB sizes, an AB309A quad stays with the smaller DIMM sizes.